A two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock

Type Article
Date 2014-11
Language English
Author(s) Gras Michael1, 2, Roel Beatriz A.3, Coppin Franck4, Foucher Eric5, Robin Jean-Paul1, 2
Affiliation(s) 1 : UMR BOREA: Biologie des ORganismes et des Ecosystèmes Aquatiques, Université de Caen Basse-Normandie, Esplanade de la paix, CS 14032, 14032 Caen, France
2 : BOREA, UMR CNRS7208, IRD207, UPMC, MNHN, UCBN, 14032 Caen, France
3 : Cefas, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK
4 : Laboratoire Ressources Halieutiques, Ifremer, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France
5 : Laboratoire Ressources Halieutiques, Ifremer, Avenue du Général de Gaulle, BP 32, 14520 Port-en-Bessin, France
Source ICES Journal of Marine Science (1054-3139) (Oxford university press), 2014-11 , Vol. 71 , N. 9 , P. 2457-2468
DOI 10.1093/icesjms/fsu081
WOS© Times Cited 9
Keyword(s) abundance indices, English Channel, exploitation rate, Sepia officinalis, SST, stock–recruitment relationship, trawl survey, two-stage biomass model
Abstract The English Channel cuttlefish (Sepia officinalis) is the most abundant cephalopod resource in the Northeast Atlantic and one of the three most valuable resources for English Channel fishers. Depletion methods and age-structured models have been used to assess the stock, though they have shown limitations related to the model assumptions and data demand. A two-stage biomass model is, therefore, proposed here using, as input data, four abundance indices derived from survey and commercial trawl data collected by Ifremer and Cefas. The model suggests great interannual variability in abundance during the 17 years of the period considered and a decreasing trend in recent years. Model results suggest that recruitment strength is independent of spawning-stock biomass, but appears to be influenced by environmental conditions such as sea surface temperature at the start of the life cycle. Trends in exploitation rate do not reveal evidence of overexploitation. Reference points are proposed and suggestions for management of the sustainable utilization of cuttlefish in the English Channel are advanced.
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